<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body" v-if="cart.length">
        <ul v-for="c in cart" class="cart-list" :key="c.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" :checked="c.isChecked" @change="checkedGoods(c)">
          </li>
          <li class="cart-list-con2">
            <img :src="c.imgUrl">
            <div class="item-msg">{{ c.skuName }}</div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{ c.skuPrice }}</span>
          </li>
          <li class="cart-list-con5">
            <a @click="changeNum('decre', c)" class="mins">-</a>
            <input autocomplete="off" type="text" :value="c.skuNum" minnum="1" class="itxt"
              @change="changeNum('input', c, $event)">
            <a @click="changeNum('incre', c)" class="plus">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{ c.skuPrice * c.skuNum }}</span>
          </li>
          <li class="cart-list-con7">
            <a href="#none" class="sindelet" @click="deleteCart(c.skuId)">删除</a>
            <br>
          </li>
        </ul>


      </div>
    </div>
    <div class="cart-tool" v-if="cart.length">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked="allChecked" @change="checkedAllGoods">
        <span>全选</span>
      </div>
      <div class="option">
        <a href="#none" @click="DeleteAll">删除选中的商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择
          <span>{{ total }}</span>件商品
        </div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{ totalPrice }}</i>
        </div>
        <div class="sumbtn">
          <router-link class="sum-btn" to="/trade">结算</router-link>
        </div>
      </div>
    </div>
    <div class="emtyp" v-if="!cart.length">
      <h1>购物车空了！</h1>
      <img src="http://49.232.112.44/img/empty.751bed26.gif" alt="">
    </div>
  </div>
</template>

<script>
import { ReqCartList, ReqCheckedList, ReqAllCheckedList, ReqDeleteList, ReqAllDelete, ReqAddCart } from "@/api"
import { goodsNumReg } from "@/utils"
export default {
  name: 'ShopCart',
  data() {
    return {
      cart: []
    }
  },
  computed: {
    allChecked() {
      return this.cart.every(item => item.isChecked === 1)
    },
    total() {
      let n = 0
      this.cart.forEach(item => {
        if (item.isChecked) {
          n += item.skuNum
        }
      })
      return n
    },
    totalPrice() {
      let n = 0
      this.cart.forEach(item => {
        if (item.isChecked) {
          n += item.skuNum * item.skuPrice
        }
      })
      return n
    }
  },
  methods: {
    async getCartList() {
      //向后台发送请求获取购物车数据
      let result = await ReqCartList();
      // console.log(result);
      //向data赋值数据
      if (result[0]) {
        this.cart = result[0].cartInfoList;
      }

    },
    async checkedGoods(onecart) {
      let { skuId, isChecked } = onecart

      let newChecked = isChecked === 1 ? 0 : 1
      await ReqCheckedList(skuId, newChecked)
      onecart.isChecked = newChecked
    },
    async checkedAllGoods(e) {
      let { checked } = e.target
      let isChecked = checked ? 1 : 0
      let skuIdList = this.cart.map(item => item.skuId)
      await ReqAllCheckedList(isChecked, skuIdList)
      this.cart.forEach(item => item.isChecked = isChecked * 1)
    },
    async deleteCart(id) {
      if (confirm("确定删除吗？")) {
        await ReqDeleteList(id)
        this.cart = this.cart.filter(item => {
          return item.skuId !== id
        })
      }
    },
    async DeleteAll() {
      if (confirm("确定删除吗？")) {
        let skuIdList = [];
        this.cart.filter(item => {
          if (item.isChecked === 1) {
            skuIdList.push(item.skuId)
          }
        })
        await ReqAllDelete(skuIdList)

        this.cart = this.cart.filter(item => {
          return !skuIdList.includes(item.skuId)
        })
      }

    },
    async changeNum(type, good, e) {
      let { skuId, skuNum } = good
      this.isLock
      if (this.isLock) return
      switch (type) {
        case 'input':
          this.isLock = true
          let { value } = e.target
          if (goodsNumReg.test(value)) {
            let distNum = value - skuNum
            await ReqAddCart(skuId, distNum)
            good.skuNum = parseInt(value)
            good.isChecked = 1
          } else if (value > 200) {
            let distNum = 200 - skuNum
            await ReqAddCart(skuId, distNum)
            good.skuNum = e.target.value = 200
            good.isChecked = 1
          } else {
            e.target.value = skuNum
          }
          break;
        case "incre":
          this.isLock = true
          if (good.skuNum < 200) {
            await ReqAddCart(skuId, 1);
            //更新当前的数据  和 isChecked
            good.skuNum += 1;
            good.isChecked = 1;
          }
          break;
        case "decre":
          this.isLock = true
          if (good.skuNum > 1) {
            await ReqAddCart(skuId, -1);
            //更新当前的数据  和 isChecked
            good.skuNum -= 1;
            good.isChecked = 1;
          }
          break;
      }
      this.isLock = false
    }
  },
  mounted() {
    //调用方法
    this.getCartList();
  }
}

</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      &>div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        &>li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con4 {
          width: 10%;
        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
            text-decoration: none;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 31px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
            text-decoration: none;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }


      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
          text-decoration: none;

          &hover {
            color: white !important;
          }
        }
      }
    }
  }

  .emtyp {
    text-align: center;
    color: gray;

    img {
      width: 200px;
      height: 100%;
    }

    h1 {
      margin: 30px 0;
    }
  }
}
</style>